Endocrinologist Dr. Peter Tong said waistlines are the best measure of obesity because these show the extent of fat accumulation in the body.

Tong said less than 20 percent of the respondents are aware of that.

Nearly all have heard of abdominal obesity but less than 10 percent know what it is, he said.

Cardiologist Dr. Roman Chiu said exercise alone cannot reduce weight and obese people have to do more including aerobic exercises at least three times a week 30 minutes to an hour at a time.

And Dr. Yeung Yat-wah, a specialist consultant in gastroenterology and hepatology, said many people mistakenly believe that many online diet programs that recommend more fruits and less carbohydrates are effective.

Yeung said skipping meals does not help either.

But avoiding food with high sugar, fat and cholesterol content and refraining from eating before sleep and not dining out too frequently will go a long way in keeping weight in check, he said.

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